feat: improve support for adaptive bedmeshes

[matmen]

Improves support for Klipper's new native adaptive bed meshes (Klipper3d/klipper#6461 Klipper3d/klipper#6473)

Shows a "virtual" bed mesh profile in the list and disables the "delete profile" button, temporary (/adaptive) profiles cannot be deleted.

[pedrolamas]

So far I only performed a quick test on this, but I'm not sure I understand why we need the new BedMeshProfileListEntry without min and max from BedMeshProfile... any specific reason for this new type?

Regarding saving an adaptive mesh, though I can't think of a scenario where that would be required, I see no problem in allowing it either, as I think Klipper will not complain if one tried to save it via BED_MESH_PROFILE SAVE=<name> command.

[pedrolamas]

I have now managed to catch up on this and even check the code changes on Klipper side.

Functionality wise, I have tested these changes in Fluidd and they worked perfectly, no issues at all!

From what I can see, Klipper makes no real distinction between a regular mesh and an adaptive mesh (except this naming convention that brings nothing special), and that is what is troubling me right now as I fail to see what increased value there is in indicating to the user that this is an adaptive mesh, which we are basing only on the mesh name!

[matmen]

Adaptive bed meshes arent reported in the bed mesh profile list, so they don't show up in the profile list in fluidd. This can be confusing to users, as there's an active bed mesh loaded, but the list doesn't show an active one (or no meshes at all if there's none defined in the config).
Showing the raw profile name and re-enabling the "Save As" button should be fine tho, I just thought a list entry with the name "adaptive" looked better than "adaptive-abcdef".